Coil balance

A contractor from Woodbridge VA says:
This is the first time I have done a coil balance. I'm not sure about the correct replacement part if you could help with that. I also need to purchase the coil for it. I'm not sure which to get.
Thanks for the help
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Bob from SWISCO responded:

This looks like a 15-180 Balance Shoe, along with a 15-181 Clip. This system uses Series 190 Coil Balances. To know what spring weights needed, look for stamps on the coil balances themselves. If there are none or you are uncertain, obtain the exact weight of the window sash. Give me that exact weight, and we can work out what you need. 

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